Police opened a criminal investigation after receiving a report Monday about suspicious items at Arrich's home. After an initial investigation, police obtained a search warrant for the residence and searched it Monday night.

As a result, police said they seized multiple computers and peripheral computer equipment along with images which were later confirmed to be child pornography.

Londonderry and Merrimack police officers were waiting for Arrich at the airport when he arrived Wednesday night and arrested him.

Authorities continue to investigate and are working with members of the Internet Crimes Against Children Task Force.

Deputy Gross mysteriously disappeared when he went to Barre to collect $250 from a man found liable in a civil matter. The next day the deputies car was found in a wooded area east of Barre. The man...